I have some LL1515. What is it and how can I use it?

LL1515 is a microphone input transformer with turns ratio 1+1:7 (200 ohm : 10k) The LL1515 is discontinued and no data sheet is available. 
For replacements, please study LL1530 or LL1576.


Pin configuration (transformer seen from component side with label readable)

4, 	3, 	2, 	1

    LL1515    

8,	7,  	6,	5        

LL1515 Usage (1:7)
in+	   pin 1 + 3  
in-	   pin 2+4  
out+	   pin 6  
out-	   pin 7  
ground  pin 5